November 19, 2015
A recent WooCommerce update broke the shop layout, but wasn’t throwing any errors. Product thumbnails, Prices and Add to Cart buttons all vanished, but were still available on the individual product pages.
Updating the template files didn’t correct the issue. The above elements were no longer loading on the Shop landing page, or with shortcode embeds of products.
Comparing the install to another WooCommerce Shop, I discovered that the Product Display options had been updated without the options selected:
Saving these selections restored the appearance of the shop. Take note that these values clear out upon save, and will need to be re-entered if the Product Display is updated in the future!